每日一练：职称英语考试综合类每日一练(2015-11-27)
【单选题】
Sleep stairs can present a particular (hazard) to older people.
A. evidence B. danger C. case D. picture
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每日一练：职称英语考试综合类每日一练(2015-11-27)
【单选题】
Sleep stairs can present a particular (hazard) to older people.
A. evidence B. danger C. case D. picture
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